World Geography - Mock Test 38

Question 371

The most common element in the earth's crust is

A) oxygen B) silicon C) hydrogen D) aluminium

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Question 372

The crust beneath the ocean basins is composed of

A) Granitic rock B) Basaltic rock C) Sedimentary rock D) Metamorphic rock

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Question 373

What is not true about the mantle

A) It extends from Moho to 2900 km. B) It forms 83 per cent of the earth by volume and 68 per cent by mass. C) It is every where in semi plastic state. D) There is increase in seismic velocity.

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Question 374

The average age of the earth is

A) 6000 million years B) 4500 million years C) 9000 million years D) 600 million years

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Question 375

The boundary between the mantle and core is called

A) Weichart–Gutenberg discontinuity B) Lehmann discontinuity C) Zehmann free velocity Zone D) None of these

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Question 376

Rocks with 65 percent silicon oxide are better termed as

A) Mafic B) Felsic C) Silicic D) Alkali

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Question 377

Which of the follownig characteristics of a sediment is least likely to change when it becomes a rock

A) Density B) Texture C) Porosity D) Composition

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Question 378

An intrusive rock is

A) volcanic lava solidified before reaching the surface. B) volcanic lava solidified after reaching the surface. C) a variety of sedimentary rock. D) a rock which has resisted erosion.

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Question 379

The rock composed mainly of volcanic is called as

A) Volcanic rocks B) Ash rocks C) Tuff D) Pyroclastic rock

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Question 380

Thickly bedded sediments are termed ______ while thinly bedded sediments are called_____

A) desiccated, massive B) cemented, desiccated C) massive, laminae D) lamlnae, massive

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